دانلود رایگان مقاله انگلیسی بررسی ظرفیت باربری عمودی و افقی از پی سطلی در خاک رس به همراه ترجمه فارسی
|عنوان فارسی مقاله:||بررسی ظرفیت باربری عمودی و افقی از پی سطلی در خاک رس|
|عنوان انگلیسی مقاله:||Evaluation of vertical and horizontal bearing capacities of bucket foundations in clay|
|رشته های مرتبط:||مهندسی عمران، سازه، خاک و پی|
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|نشریه||الزویر – Elsevier|
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The present paper presents the results of three-dimensional finite element analyses of bucket foundations in normally consolidated uniform clay under undrained conditions. The stress–strain response of clay was simulated using the Tresca criterion. The bearing capacities were calculated and found to be largely dependent on the aspect ratio of the bucket foundation. Based on the results of the analyses, new equations were proposed for calculating vertical and horizontal bearing capacities. In the proposed equations, the vertical capacity consisted of an end-bearing resistance and a skin friction resistance, whereas the horizontal capacity consisted of a normal resistance, a radial shear resistance, and a base shear resistance. Comparison of the numerical results showed that the proposed equations properly predicted the capacities of the bucket foundations in uniform or non-uniform clays.
A bucket foundation is a circular surface foundation with thin skirts around the circumference. Bucket foundations have been used extensively in offshore facilities, such as platforms, wind turbines, or jacket structures (Tjelta and Haaland, 1993; Bransby and Randolph, 1998; Houlsby et al., 2005; Luke et al., 2005). The skirt of a bucket foundation is first penetrated into the seabed by a self-weight. Further penetration is achieved by pumping water out of the bucket foundation, creating a suction pressure inside it. Penetration stops when the top-plate of the bucket comes in contact with the seabed, and the suction pressure confines a plugged soil within the skirt. Several studies on bucket foundations in clay have been conducted. Previous numerical studies assumed that the foundation was either a skirted strip foundation in two-dimensional (2D) finite element (FE) analyses (Bransby and Randolph, 1998, 1999; Yun and Bransby, 2007a,b; Gourvenec, 2008; Bransby and Yun, 2009) or an equivalent surface circular foundation in threedimensional (3D) FE analyses without modeling the embedment of the foundation (Tani and Craig, 1995; Bransby and Randolph, 1998). A few numerical studies have performed 3D FE analyses on bucket foundations for wind turbines (Zhan and Liu, 2010), and suction anchor cases (Sukumaran et al., 1999; Monajemi and Razak, 2009). The bearing capacity of the bucket foundation is significantly affected by the skirt embedment depth or 3D shape. Deeper embedment of the bucket foundation induces more vertical and horizontal capacities attributable to the mobilization of the side friction and the lateral resistance along the skirt. A 3D geometry of the foundation should be modeled to consider the shape effect and the soil–bucket interaction. In addition, previous design equations have been developed based on numerical results, which have the aforementioned limitations. Therefore, the development of design equations based on accurate numerical results, which consider 3D soil-structure interactions and the exact shape of the bucket foundation is necessary. In the present study, a series of 3D FE analyses were performed to evaluate the effect of the aspect ratios of the bucket foundation, L/D, where L is the skirt length and D is foundation diameter, on the vertical (V0) and horizontal (H0) bearing capacities of bucket foundations for wind turbines. The L/D ratio is usually less than 1.0, as shown in Fig. 1. The soil condition was assumed to be normally consolidated uniform clay. The vertical and the horizontal loadings were applied, and the effect of the L/D ratio on the capacity was carefully analyzed. Simple design equations were developed based on the results of the analyses to evaluate vertical and horizontal capacities.